Electrical heating unit.



F. KUHN 64 J. A. HAND.

ELECTRICAL HEATING UNIT.

APPLICATION F ILED JAN. 25. 1917' 1,247,286. PatentedNov. 20, 1917.

wuzulim Jay a/mf/awd $1 wmw WUVW arm/W 5 UNITED STATES PATENT OFFICE.

FRANK KUHN AND JAY A. HAND, OF DETROIT, MICHIGAN, ASSIGNORS T0 AMERICAN ELECTRICAL HEATER COMPANY, 011' DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN.

ELECTRICAL HEATING UNIT.

To all whom it may concern:

Be it known that we, FRANK KUHN and JAY A. HAND, both citizens of the United States of America, residing at Detroit, in the county of Wayne and State of Michigan,

have invented certain new and useful Improvements in Electrical Heating Units, of which the following is a specification, ref erence being had therein to the accompanying drawings.

The invention relates toelectrical heating units of the exposed resistor type and has particular reference to the construction of the resistor-supporting frame as hereinafter set forth.

In the drawings:

Figure 1 is a perspective view of the unit;

Fig. 2 is an elevation of a flat blank from which the resistor-supporting frame is formed;

Fig. 3 is a horizontal section; and

Fig. 4 is an enlarged detail view.

A is a blank of sheet-metal, which is fashioned to form a plurality of radially-extending bars B connected by a top ring C and basering D, each of the bars being formed with a series of embossed and centrally-apertured portions E. F and G are insulator cap and base members, respectively engaging the rings C and D, and H is a tie-rod for connecting said cap and base members. The base member G has mounted thereon a screw-threaded contact member 1, suitable for engaging an ordinary lamp socket, and the tie-rod H is extended to the bottom of the base to form the cooperating contact member. J is a resistor in the form of a coil of wire, which is threaded through the apertures in the bars B and wound spirally around the frame from top to base. To insulate the risistor from the frame bars, insulator disks K and K are placed on opposite sides of the bar, the (115k K fitting within the recess formed by the embossed portion E. The two disks are then clamped together by a hollow rivet pass ing through a central aperture thereln, and as the diameter of this rivet is less than the aperture in the bar it will be insulated from the frame. The upper end of the resistor is connected with the tie-rod H, and through the latter with the central contact in the base and the lower end of the resistor passes Specification of Letters Patent. Patented N 20, 1917, Application filed January 25, 1917.

Serial No. 144,372.

through the insulator base into connection 56 with the screw-threaded contact I.

In use, the unit may be engaged with any ordinary lamp-socket and the heat generated in the resistor will be dissipated by radiation. The frame forms a firm mechanical support for each of the convolutions of the resistor and at the same time is thoroughly insulated therefrom.

What we claim as our invention is 1. An electrical heating unit, comprising an insulator base, a metallic frame mounted on said base and comprising a series of integral bars arranged in radial planes and longitudinally extending in the same direction, each of said bars having a series of 70 apertures therein extending substantially the length thereof, insulated bushings in the apertures of said bars, and a resistor wound spirally about the frame. I

2. In an electrical heating unit, the com bination with an insulator base, of a frame mounted thereon, comprising a series of bars arranged in radial planes, each of said bars having a series of apertures therein, insulated bushings in said apertures, a resistor in the form of a wire coil, threaded through said bushings and wound spirally about said frame, terminal contacts on said base connected with the opposite ends of said resistor, and means for holding said frame upon said insulator base, connecting one end of said resistor to one of the terminal contacts.

3. An electrical heating unit, comprising a frame formed of a sheet-metal blank, fashioned to have a series of bars arranged in radial planes and connecting rings at the upper and lower ends thereof, each of said bars being also provided with a series of apertures, insulated bushings in said apertures, an insulator base and insulator cap respectively engaging the lower and upper connecting rings, a tie-rod between said cap and base extended to form a central contact in the bottom of the base, a threaded contact surrounding the base, and a resistor threaded through said insulated bushings and wound spirally about the frame, one end of said resistor being connected to said tierod and the opposite end to said threaded contact. 1

4:. An electrical heating unit, comprising an integral sheet-metal blank struck-out to form top and bottom rings and a series of radial bars extending between said rings, each of said bars having a series of apertures therethrough, insulated bushings in said apertures, an insulator cap and an insulator base respectively engaging the upper and lower rings of the frame, a tie-rod connecting said cap and base, a resistor threaded through said insulated bushings, extending spirall about said frame, and terminal contacts on said base, with which the opposite ends of said resistor are connected.

5. An electrical heating unit, comprising an integral sheet-metal frame having top and bottom rings and a series of radial bars 15 extending between said rings, each of said bars having a series of apertures therein, insulated bushings in said apertures, and a resistor wound spirally about said frame.

In testimony whereof We affix our signa- 20 tures in presence of two Witnesses.

' FRANK KUHN.

J AY A. HAND. \Vitnesses HARRY A. LUYoKx, ARCHIE OAKES. 

